How to prepare the DNP/5280 for Watchdog usage

DIL/NetPC DNP/5280 – microHOWTO
How to prepare the DNP/5280 for Watchdog usage
The DIL/NetPC DNP/5280 offers a hardware watchdog. This watchdog timer generates a reset after
a master enable and without a valid trigger sequence within a specific time period.
•
1. Step: Setup a serial link (RS232 Serial Link) between the DIL/NetPC DNP/5280 COM1
serial port and a serial port of your PC system. Use a null-modem cable and the RS232 interface
cable for the physical connection between the COM1 port of the DIL/NetPC DNP/5280 and the
PC COM port. For more details about this connection please use the DIL/NetPC DNP/5280
Starter Kit documentation.
•
2. Step: Set the RCM jumper bridge of your DIL/NetPC DNP/5280 to boot the Motorola dBUG
ROM Monitor program directly from the DIL/NetPC DNP/5280 on-board flash memory. For
more details about this jumper bridge use the DIL/NetPC DNP/5280 Starter Kit documentation.
•
3. Step: Run your terminal emulation program. Microsoft Windows-based PC systems offers
HyperTerminal for this task. Linux-based systems come with Minicom. Then provide the
DIL/NetPC DNP/5280 with power.
•
4. Step: Check the dBUG ROM Monitor program version. We need Motorola dBUG ROM
Monitor Firmware Version 3b.1a.10 (Build 7 on Jul 13 2004) or newer for watchdog usage.
For more details about the dBUG program version information and the dBUG exchange process
please see the documents mHT5280-26.pdf: How to identify the dBUG ROM Monitor Program
Version and mHT5280-27.pdf: How to exchange the dBUG ROM Monitor Program.
•
5. Step: Use the dBUG show command. The last information line shows the current state of the
DIL/NetPC DNP/5280 watchdog timer (master enable or master disable).
SSV EMBEDDED SYSTEMS 2004, mHT5280-28.doc, Rev. 1.00.
1
DIL/NetPC DNP/5280 – microHOWTO
watchdog: off
watchdog: on
•
Watchdog Master Disable. Watchdog timer off.
Watchdog Master Enable. Watchdog timer on after Linux boot.
6. Step: Use the dBUG watchdog master enable command if necessary. Enter the following
command line for watchdog master enable:
set watchdog on
After a watchdog master enable the watchdog timer needs a valid trigger sequence within
a specific time period if Linux is running.
•
7. Step: Use the dBUG watchdog master disable command if necessary. Enter the following
command line for watchdog master disable:
set watchdog off
That is all.
SSV EMBEDDED SYSTEMS 2004, mHT5280-28.doc, Rev. 1.00.
2